/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package fr.loof.fonzie.jpql;

import java.util.HashMap;
import java.util.Map;

/**
 * @author <a href="nicolas@apache.org">Nicolas De Loof</a>
 */
public class QueryBuilder
{
    private StringBuilder jpql = new StringBuilder();

    private String separator = " where ";

    private Map<String, Object> parameters = new HashMap<String, Object>();

    public QueryBuilder from( Class entity )
    {
        jpql.append( "select e " ).append( " from " ).append( entity.getSimpleName() ).append( " e" );
        return this;
    }

    public QueryBuilder eq( String property, Object value )
    {
        if ( value != null )
        {
            jpql.append( separator ).append( "e." ).append( property ).append( " = :" ).append( property );
            parameters.put( property, value );
            separator = " and ";
        }
        return this;
    }

}
